Part 1
Sans the larger lectures, students should be getting the same seminars and practicals, as these are where the true learning happens.
One thing that (as a lecturer responsible for running a degree course) seems to be coming through to me is that the majority of students haven't reflected on what this in person teaching will look like (and I don't blame them - I hadn't until I sat down to start planning sessions in August).
The normal 'small-group discussions' can't happen as we will be having to maintain social distancing. Everyone will be in masks anyway and while we will have the visor-style masks, I suspect most students will be in voice-muffling ones. We can't print out and pass materials around, and we can't let students share pens/paper. That really eliminates most 'table-work' as well that a group might do eg filling out ideas on a flip-chart, solving a task or discussing an article together. We can (and are) redesigning the in-person activities that we're doing and I still think that they add value, but frankly I think they add less value than the traditional seminar.
Lab practicals will be very limited: with reduced numbers in, there is less time available per class. It will only be very essential stuff, with teaching deferred to other years. Same goes for fieldwork of most kinds. IT room practicals can happen but again there will be differences eg someone can't come and lean over your shoulder, or use your mouse/keyboard. As with seminars they still add value, but much less so than previously.
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Part 2
If I was in complete control of things at my uni, I'd move 90% of timetabled activites online, with exceptions based mainly on the nature of what's being taught - it would mainly be skills/methods material in-person. I'd then give all students a fortnightly meeting in an office with a personal tutor who can discuss progress, readings, assessments etc. This doesn't sound like a lot but actually in a well-run meeting, a lot of guidance can be given in this sort of context. These meetings are also just about the safest thing you can do as you can maintain 2m distancing, masks can be worn and sanitizers used. Then also make sure all lecturing staff have at least 3 hours-worth of additional bookable meeting slots a week for other students.
The other advantage of this approach is that individual meetings can easily be moved online if there are local lockdowns, or if individual staff/students need to do so for health or other reasons. Trying to timetable people to all be in one place together is going to just fall part I think. Near me we've had a flare-up in cases (I live 5 miles from
this football club which has been blamed for much of it), which in turn has caused things like schools and nurseries to close. This will keep happening at different locations, and I increasingly feel that if we organize group-sized in-person teaching with any regularity, we're just going to end up with so much of it being cancelled because staff/students will miss sessions due to self-isolating, or having to be off work for emergency childcare because their kids' school was shut that morning, or because of a local lockdown etc etc. In a way, it's not even the risk of spreading the disease in the class itself that's the problem, but the practicality of reliably getting 20 people together in a room at the same time and keeping to some sort of timetable that gets the teaching done by May.